One of the props, the one that started out as 19x13, was heavily modified 4 or 5 times, sanding and grinding away at it until the SAP would turn the 13" pitch. I had thinned down the hub area on it, pushing the envelope and did not carbon the blades as well or as completely as as I have been all the others.

It shucked a blade during one of the misfiring runs I made on the SAP. When the engine misfired at full revs, one blade snapped at the hub.

The other two,the 19x10 and the 18x12 are fine but I have not run them all that much. These props must be trusted for 100s of flights. The weight penalty is only a few more grams and the technique is straight forward so why not laminate the whole prop? It's a stressed skin that results in a superior product. This is the way I will make them from now on

Matt